7
0  6  0 0 0 1  8 
6  0 20 0 0 0 14
0 20  0 6 0 0  2
0  0  6 0 4 0  1
0  0  0 4 0 2  6 
1  0  0 0 2 0  5 
8 14  2 1 6 5  0